How to Re-Snap a Pool Liner Bead Into a Liner Track
Allow the water level in the pool to go down at least one foot.
Verify that there is no one in the pool and that no one intends to enter the pool while you are working. This step is crucial as you will be using electricity close to the water.
Heat the pool liner with the hair dryer. Make sure you hold the hair dryer 12 to 18 inches away from the liner and keep the dryer moving so you do not melt a hole in the liner.
When the liner has become warm enough to stretch, pull the liner until the bead is again aligned with the liner track. If the liner cools too much during this process, it will lose its elasticity and need to be heated again.
Push the bead into the liner track when the two parts are aligned.
Install a liner lock on the pool to prevent the liner bead from coming out again.